Sources of lead contamination

According to Wikipedia, "Lead contamination in modern Oakland comes from three primary sources: remnants from previous industry, deposits from pre-ban leaded gasoline, and paint chips from pre-ban leaded paints.[2][3] Not all areas of Oakland are affected equally: West Oakland's contamination is especially severe, particularly near the former Oakland Army Base, and many of Oakland's poorer neighborhoods also suffer disproportionately (since residents often lack the socioeconomic resources to remediate their lawns, or even to repaint their houses.)"

This page could use:

how to test your soil

how to remediate soil

are there fruits/vegetables/trees that are okay to plant even in contaminated soil?